Bevel-square.



PATENTED APR. 17, 1906.

T. S. ROSS. BEVBL SQUARE. APPLICATION FILED Nov. 14, 1905.

JNI/ENTOR.

MW. /'w

ATTORNEY.

fr H l lu1n2x1mlmlmluumlmm1 UNITED sTArEs PArENT onirica.

THQMAS S. ROSS, vO1? BALTIMORE, MARYLAND, ASSIGNOR OF ONE-THIRD TO MICHAEL H., NOON AND ONE-THIRD TO JAMES J. ELLIS.

BEVEL-SQUARE.

Specication of Letters Patent.

Patented April 17, 1906.

Applica/ion mea November 14,1905. serial No. 287,214.

To all whom it may concern:

Be it known that I, THOMAS S. Ross, a citizen of theyUnite'd States, residing atBaltimore city, State of Maryland, have invented certain new and useful Improvements in Bevel-Squares, of which the following is a Specification.

My invention relates to an improvement in bevelsquare rules, the object of which is to supply a rule which is accurate and quick of adjustment and one when once adjusted can be permanently held in such adjustment without danger of slip ing while being used in the execution of simi ar purposes for which it was originally adjusted.

By the use of my invention the same results l can be obtained without the use of several the ,lookin thereto by means of the screws 6 6.

separate and distinct draftin 'instruments required to otherwise aocomp ish the same results. y

By the use of my invention the possibility of making errors in calculation in different degrees of drawing and spacing is greatly overcome. The-time required in execution is 4lessened by having the single instrument which can be used to advantage over the several others that would ordinarily be required,

With the foregoing object in view my invention consists in certain novel features of construction and combination of parts, which will be hereinafter described, and pointed out Ain the claims4 In'the accompanying drawings, Figure 1 is a perspective vlew of my invention.' Fig. 2 is alongitudinal sectional view of the stock, showing the semicircular female member of device. Fig. 3 is aview of the male mem er of the locking device. Fig. 4 is a face lview of the under side of the rulebla'de.

In Fig. 1, A is a rule-blade provided with a 'scale 1 and 2 on each tapered edge. B is the stock, being rovided with the scale 3 and also with the ocking device 4, which is countersunk in the surface thereof and held firmly 7 7 are recesses adapted to engage into locking contact with the point 8 of Fig. 3. 9 is a thumbscrew, by which the rule-blade A isheld firmly to the stock B by means of the circular threaded hole 17, which engages the thread (not shown) on the thumb-screw. 16 is a washer between the thumb-screw 9 and the blade A. The rule-blade A is longtudinally slotted at 1() and provided with the slide 1]. and thu1nb-screw 12 and with the projections 14 and scale 13 13.

In. Fig. 3, 6 is a thumb-nut provided with the stem 1 and adapted to enterthe hollow casting 2 and fit loosely therein. 3 is a metal plug hollowed out and threaded at 4 to allow the stern 1 to be screwed therein. Between the plug 3 and the upper inner part of the casting and wound around thestenl 1 is a spring 5, and by reason of the thumb-nut the tension can be tightened or loosened, desired.

ln Fig. 4, 1 is a washer into which the thumb-screw 12 of llig. 1 is screwed therein by means of a thread. (Not shown.) 2 represents a hollowed-out groove by means of which the washer 1 is moved backward and forward. The slide 1]. is controlled or made permanent by means of the thumb-screw 12.

Inassembling my device the rule-blade A is fixedY to the stock B by means of the setscrew 9 and the point 8 in Fig. 3 is fitted in and adapted to engage in the recesses 7 7. By this means therule-blade A can beturned at any angle and by meansof the attachment permanently held thereto, so as not to slip or ecome displaced. while in use, yet it may be readily moved to orkl'rom one disk to the other at will. The slide on the rule-blade performs two functions: First, it acts as a guard., so that when adjusted in the rulingl of a line of a certain length thereis no danger of going beyond thel point desired. It also provided with a circular hole 15, through which a drawing instrument may be inserted for the purpose of making circular lines. It will thus be seen that in use the rulc can be quickly adjusted to meet the requirements without the use of one or more separate instruments that might be required to produce the same results.

The scale on the rule-blade in conjunction with the scale on the stock saves time in making measurements in the ruling of lines of a desired space apart as well as in the calculation of making angles, semicircumfen ences, and the like as may be required. Also there is but little llanger of accidental displacement after adjustment, yet by its simplicity a littleor no effort is required in making or changing to an adjustment desired.

From the foregoing it will be seen that l have provided a simple device for purposes usually requiring more or less additional in- Ioo form and arrangement of ,.15 stock being provided with a semicircular 2O a hollow casting, a metal plug,

taching the blade to4 3o with scale thereon,

"- tudinal struments in accomplishing the same results, thereby reducing the cost, saving of time inv the use thereof, and inducing its adoption. Slight changes might be resorted to in-the the several parts described without departing from the s irit and scope of my invention, and hence do not desire to limit vmyself to the exact construction as therein set forth; but,

Having fully described my invention, what l claim, and desire to secure by Letters Patent, is v 1.l A bevel-square rule comprising a stock and blade and a locking device therefor, the

3. A bevel-square rule comprising a stock with a scale thereon, a semicircular plate provided with recesses secured to the to part of the stock by suitable means in com ination with a blade having scales thereon, said blade having locking means to engage in the recesses, a longitudinal slot cut through the center of the blade, a slide ,provided with an extension and a hole therein, a washer on the under part, a thumb screw to engage the washer whereby the slide is secured to the blade, substantially as herein described.

4. A bevel-square rule comprising a stock with scale thereon, in combination with a blade having beveled edges and scale, and having a longitudinal slot vin the-center, a slide having an extension and a hole in the extension, means of adjustably securing the slide to the blade, the blade being secured to the stock by means of a setscrew substantially as described.

5. A bevel-square rule comprising a stock, scale thereon, a semicircular plate provided with recesses secured to the to stock by suitable means in com mation with a blade having beveled ed es and scale thereon and provided with adocking means wherebyfthe recesses on the stock are engaged, a longitudinal slot in the center of the blade, a slide having extensions Ato form a gage a hole 15 in said slide, a thumb-screw plate having recesses in the top part thereof, the blade having a scale thereon', in combination with a locking device therefor, consisting of a thumb-nut provided with a stem,

means of atataching the plu to the stem, a spring arranged around t e stem and located within the casting between the plugand the upper part of the casting and means' of pivotally at the stock so that the plug may become engaged in the recesses of the plate on the stock substantially as described. A

2. A bevel-square rule comprising a stock a semicircularplate providedwith recesses attached to the top part thereof, in combination with a blade with beveled edges and scale thereon and means for engaging the recesses,and having a longislot cut throughfthe center, a slide having an extension with a hole in the extension 'and' secured to the blade by a-thumbvscrew and washer and means for securing the .l blade to the stock substantially as described.

substantially as herein described.

In testimony whereot` I aflix my signature in presence of, two witnesses.

' THOMAS S. ROSS.

Witnesses:

JOHN F. SCHULZ, MARY M. MAGRAW.

.55 provided with part of the '70 and washer attaching the slide to the blade 

